Bassist Greg Churchouse said of this song: "It's your classic tale of seeing a girl or a guy and getting that funny feeling in your tummy and not being able to say a coherent sentence to them."

Churchouse told ilikemusic.com that originally they didn't see this as a single release: "Heartbeat was quite a surprise for us because originally when we recorded it in the studio, it was going to be a B-side but we chopped a couple of bits out, some bridges and messed around with the arrangements and got it down to a two minutes 50 pop song, straight in there."